Daniel,
Kyle is on the money. Its a marathon, not a sprint. To give you some perspective for a bit of a laugh...
During your life you're not going to have a steady upward path in everything. You will:
1. lose jobs: Yep, got sacked a few years back and was the sole income earner at the time with a couple of mortgages...
2. be dumped by spouse: Not yet luckily...
3. smash your car: hah, far too often...
4. lose your favourite records or destroy your favourite book: common occurance...
5. have to move house to some place you don't like much: why do you think I'm in Brisbane now? Work said move or get sacked again, your choice. I moved...
6. get sick or injured: Still working through my shoulder injury...
But I'm 40 mate and still lifting, and to be honest making some of the best gains of my life. Its a mental game as much as anything. Even my missus told me I was fat last night which I'm now dealing with mentally. Mental toughness will see you through. Stick with it.
Cheers,
Mike